A89: Re: Re: Re: Re: Line 1111 error?
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A89: Re: Re: Re: Re: Line 1111 error?
no it didn't crash, but I'm assuming since the X, instead of being the
correct value, was off in lala land so it might've been drawn WAYYY off
screen :)
Now it works, thanks for your guys help.
----- Original Message -----
From: "Olle Hedman" <oh@hem.passagen.se>
To: <assembly-89@lists.ticalc.org>
Sent: Sunday, October 01, 2000 4:53 PM
Subject: A89: Re: Re: Re: Line 1111 error?
>
> the return address is on top of the stack and is a long.
> try
>
> move.w 4(a7),d1 ; Read Y Value
> move.w 6(a7),d0 ; Read X Value
>
> instead.
>
> you say "doesn't _even_ show up"? does it still crash?
> If you should save the regs, you should do it before you change them too..
> that is, right after the label.
>
> ///Olle
>
> ----- Original Message -----
> From: "Josh 'Gage'" <antgage@apk.net>
> To: <assembly-89@lists.ticalc.org>
> Sent: Sunday, October 01, 2000 10:32 PM
> Subject: A89: Re: Re: Line 1111 error?
>
>
> >
> > ok, so my new piece of code is like so:
> >
> > LowDrawSprite:
> > move.w 2(a7),d1 ; Read Y Value
> > move.w 4(a7),d0 ; Read X Value
> >
> > ; Don't need these?
> > ;movem d0-d2/a0-a1,-(a7) ; Save Registers
> >
> > lea mario_standing_0(pc),a0
> >
> > jsr graphlib::put_sprite ; Draw Sprite
> >
> > ;movem (a7)+,d0-d2/a0-a1 ; Restore Registers
> >
> > rts
> >
> > now my sprite doesn't even show up on the screen...
> >
> > thanks for the help guys, I know I'm a newbie at this stuff, im just
> > thankful that you guys aren't being asses about it :)
> >
> > ----- Original Message -----
> > From: "Olle Hedman" <oh@hem.passagen.se>
> > To: <assembly-89@lists.ticalc.org>
> > Sent: Sunday, October 01, 2000 3:04 PM
> > Subject: A89: Re: Line 1111 error?
> >
> >
> > >
> > > You screwed up your stack. On the top of the stack there is the return
> > > address for the rts.
> > > And when you read the values off the stack for a subroutine like this,
> you
> > > should _not_ use (a7)+, that changes the stack pointer value.
> > > You should read them like 4(a7) and 6(a7) or something like that
> instead.
> > > (I guess there is where your x and y is located.)
> > > And why trash d6 and d7 and save d0 and d1? isn't it better the other
> way
> > > around?
> > > I think the calling convention assumes d0, d1 and a0 destroyed, so you
> > > shouldn't have to save thoose.
> > > (if useing it in C)
> > >
> > > ///Olle
> > >
> > > ----- Original Message -----
> > > From: "Josh 'Gage'" <antgage@apk.net>
> > > To: "Assembly 89 LIST" <assembly-89@lists.ticalc.org>
> > > Sent: Sunday, October 01, 2000 8:22 PM
> > > Subject: A89: Line 1111 error?
> > >
> > >
> > > >
> > > > I've been banging my head against the wall trying this piece of
code:
> > > >
> > > > ; LowDrawSprite( x, y, sprite )
> > > > ; Draws Sprite at (x,y)
> > > > LowDrawSprite:
> > > > ;;;;;
> > > > ; Temp Move x,y to d6,d7
> > > > ;move.w (a7)+,d7
> > > > ;move.w (a7)+,d6
> > > >
> > > > move.w #10,d7
> > > > move.w #15,d6
> > > >
> > > > movem d0-d2/a0-a1,-(a7) ; Save Registers
> > > >
> > > > move.w d7,d1
> > > > move.w d6,d0
> > > > lea mario_standing_0(pc),a0
> > > >
> > > >
> > > > jsr graphlib::put_sprite ; Draw Sprite
> > > >
> > > > movem (a7)+,d0-d2/a0-a1 ; Restore Registers
> > > >
> > > > rts
> > > >
> > > > now if you compile like that, it's fine. However since this is a
TIGCC
> > Low
> > > > Level Command(for C), I want to read the x,y values from the stack.
I
> > > tried
> > > > the first two commands(uncomment the first pair of commands and
> comment
> > > the
> > > > second pair), and I get an error 1111 thing. What's the deal?
> > > >
> > > > I'm still learning assembly so don't bitch at me too much :)
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>
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